On the soot combustion mechanism using 3DOM ceria catalysts

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Title: On the soot combustion mechanism using 3DOM ceria catalysts
Authors: Alcalde-Santiago, Virginia | Davó-Quiñonero, Arantxa | Lozano Castelló, Dolores | Bueno López, Agustín
Research Group/s: Materiales Carbonosos y Medio Ambiente
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: Soot | Ceria | 3DOM | Active oxygen | NOx | Diesel
Knowledge Area: Química Inorgánica
Issue Date: 6-Oct-2018
Publisher: Elsevier
Citation: Applied Catalysis B: Environmental. 2018, 234: 187-197. doi:10.1016/j.apcatb.2018.04.023
Abstract: CeO2 catalysts have been prepared with conventional (Ref) and three dimensionally order macroporous (3DOM) structures, and the effect of the structure on the soot combustion mechanism has been studied in detail. Isotopic exchange experiments showed that the CeO2-3DOM catalyst produces more active oxygen upon O2 chemisorption than the counterpart CeO2-Ref catalyst, and this active oxygen is transferred more efficiently to soot due to the macroporous structure. CeO2-3DOM and CeO2-Ref also accelerate the oxidation of NO to NO2, and their activity is equal. However, CeO2-3DOM utilizes NO2 more efficiently than CeO2-Ref for soot combustion. NO2 has two roles in the soot combustion mechanism: i) reacts with soot and ii) is chemisorbed on ceria and produces active oxygen, which is more oxidizing than NO2. In ceria catalysts with a conventional structure, the main role of NO2 is the direct oxidation of soot, because active oxygen has restrictions to be transferred from catalyst to soot due to the poor soot-catalyst solid-solid contact. However, the 3DOM structure improves the transfer of active oxygen, and therefore, an additional benefit is obtained from NO2, that is, NO2 contributes to active oxygen production and the 3DOM structure allows its efficient transference to soot.
Sponsor: The authors thank the financial support of Generalitat Valenciana (Project PROMETEOII/2014/010), the Spanish Ministry of Economy and Competitiveness (Project CTQ2015-67597-C2-2-R), the Spanish Ministry of Education, Culture and Sports (grant FPU14/01178) and the UE (FEDER funding).
URI: http://hdl.handle.net/10045/75179
ISSN: 0926-3373 (Print) | 1873-3883 (Online)
DOI: 10.1016/j.apcatb.2018.04.023
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2018 Elsevier B.V.
Peer Review: si
Publisher version: https://doi.org/10.1016/j.apcatb.2018.04.023
Appears in Collections:INV - MCMA - Artículos de Revistas

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